/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_SVG_SVGANIMATEDPOINTLIST_H_
#define DOM_SVG_SVGANIMATEDPOINTLIST_H_
#include "mozilla/Attributes.h"
#include "mozilla/SMILAttr.h"
#include "mozilla/UniquePtr.h"
#include "SVGPointList.h"
namespace mozilla {
class SMILValue;
namespace dom {
class DOMSVGPoint;
class DOMSVGPointList;
class SVGAnimationElement;
class SVGElement;
}
// namespace dom
/**
* Class SVGAnimatedPointList
*
* Despite the fact that no SVGAnimatedPointList interface or objects exist
* in the SVG specification (unlike e.g. SVGAnimated*Length*List), we
* nevertheless have this internal class. (Note that there is an
* SVGAnimatedPoints interface, but that's quite different to
* SVGAnimatedLengthList since it is inherited by elements, as opposed to
* elements having members of that type.) The reason that we have this class is
* to provide a single locked down point of entry to the SVGPointList objects,
* which helps ensure that the DOM wrappers for SVGPointList objects' are
* always kept in sync. This is vitally important (see the comment in
* DOMSVGPointList::InternalListWillChangeTo) and frees consumers from having
* to know or worry about wrappers (or forget about them!) for the most part.
*/
class SVGAnimatedPointList {
// friends so that they can get write access to mBaseVal and mAnimVal
friend class dom::DOMSVGPoint;
friend class dom::DOMSVGPointList;
public:
SVGAnimatedPointList() =
default;
SVGAnimatedPointList&
operator=(
const SVGAnimatedPointList& aOther) {
mBaseVal = aOther.mBaseVal;
if (aOther.mAnimVal) {
mAnimVal = MakeUnique<SVGPointList>(*aOther.mAnimVal);
}
return *
this;
}
/**
* Because it's so important that mBaseVal and its DOMSVGPointList wrapper
* (if any) be kept in sync (see the comment in
* DOMSVGPointList::InternalListWillChangeTo), this method returns a const
* reference. Only our friend classes may get mutable references to mBaseVal.
*/
const SVGPointList& GetBaseValue()
const {
return mBaseVal; }
nsresult SetBaseValueString(
const nsAString& aValue);
void ClearBaseValue();
/**
* const! See comment for GetBaseValue!
*/
const SVGPointList& GetAnimValue()
const {
return mAnimVal ? *mAnimVal : mBaseVal;
}
nsresult SetAnimValue(
const SVGPointList& aNewAnimValue,
dom::SVGElement* aElement);
void ClearAnimValue(dom::SVGElement* aElement);
/**
* Needed for correct DOM wrapper construction since GetAnimValue may
* actually return the baseVal!
*/
void* GetBaseValKey()
const {
return (
void*)&mBaseVal; }
void* GetAnimValKey()
const {
return (
void*)&mAnimVal; }
bool IsAnimating()
const {
return !!mAnimVal; }
UniquePtr<SMILAttr> ToSMILAttr(dom::SVGElement* aElement);
private:
// mAnimVal is a pointer to allow us to determine if we're being animated or
// not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
// if we're animating is not an option, since that would break animation *to*
// the empty string (<set to="">).
SVGPointList mBaseVal;
UniquePtr<SVGPointList> mAnimVal;
struct SMILAnimatedPointList :
public SMILAttr {
public:
SMILAnimatedPointList(SVGAnimatedPointList* aVal, dom::SVGElement* aElement)
: mVal(aVal), mElement(aElement) {}
// These will stay alive because a SMILAttr only lives as long
// as the Compositing step, and DOM elements don't get a chance to
// die during that.
SVGAnimatedPointList* mVal;
dom::SVGElement* mElement;
// SMILAttr methods
nsresult ValueFromString(
const nsAString& aStr,
const dom::SVGAnimationElement* aSrcElement,
SMILValue& aValue,
bool& aPreventCachingOfSandwich)
const override;
SMILValue GetBaseValue()
const override;
void ClearAnimValue() override;
nsresult SetAnimValue(
const SMILValue& aValue) override;
};
};
}
// namespace mozilla
#endif // DOM_SVG_SVGANIMATEDPOINTLIST_H_
